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Separator and lithium-sulfur battery comprising same

A lithium-sulfur battery and diaphragm technology, applied in the field of lithium-sulfur batteries, can solve problems such as degradation, sulfur loss methods, battery side reactions, etc.

Pending Publication Date: 2020-06-19
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the lithium polysulfides cause a shuttle reaction during charging, resulting in a significant decrease in charge-discharge efficiency
[0006] In order to solve these problems, the method of adding additives having sulfur adsorption properties has been proposed, however, the problem of deterioration has newly arisen, generating additional battery side reactions
In view of the above, in order to delay the outflow of sulfur, which is the positive active material, methods of adding metal chalcogenides, alumina, etc., or coating the surface with oxidized carbonate, etc., have been proposed, however, these methods either have Sulfur loss is either complex and also limits the amount of active material, i.e. sulfur, to be introduced (i.e. loading)

Method used

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  • Separator and lithium-sulfur battery comprising same
  • Separator and lithium-sulfur battery comprising same
  • Separator and lithium-sulfur battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] (1) Preparation of diaphragm

[0109] As a porous substrate, a polyethylene (50% porosity) film with a thickness of 20 μm was prepared.

[0110] Introduced carbon nanotubes (oxygen atom content in carbon nanotubes is 4% to 5%) aqueous dispersion (concentration is 0.002% by weight) and lithiated perfluorinated sulfonic acid resin (Du Pont Company) aqueous dispersion with carboxyl group (Concentration: 0.25 mg / mL) After mixing, ultrasonic waves were applied thereto for 8 hours to prepare a coating solution (carbon nanotube:lithiated perfluorosulfonic acid resin=1:12.5 weight ratio).

[0111] The coating solution was poured on the porous substrate, and the resultant was vacuum-filtered to obtain a concentration of 10 μg / cm on the surface of the porous substrate facing the positive electrode. 2 way to form a coating. The resultant was dried at 70° C. for 24 hours to prepare a separator. Here, the coating is measured to have a thickness of approximately 3.1 μm±0.5 μm.

...

Embodiment 2

[0116] A lithium-sulfur battery was fabricated in the same manner as in Example 1 except for using carbon nanotubes into which a hydroxyl group (—OH) was introduced.

experiment example 1

[0122] Each lithium-sulfur battery manufactured in Examples and Comparative Examples was operated under 0.3C / 0.5C charge / discharge conditions. The initial charge and discharge capacity was measured and the change in capacity of the lithium-sulfur battery was confirmed.

[0123] figure 2 is a graph showing the initial charge and discharge capacities of the lithium-sulfur batteries manufactured in Examples 1 and 2 and Comparative Example 1. when referring to figure 2 It can be seen that the batteries of Examples 1 and 2 with the coating according to the invention had a higher initial discharge capacity than the battery of Comparative Example 1 which was not provided with the coating.

[0124] image 3 is a graph showing the lifetime characteristics of the lithium-sulfur batteries manufactured in Examples 1 and 2 and Comparative Example 1. when referring to image 3 It can be seen that the batteries of Examples 1 and 2 have higher relative to initial charge and discharge t...

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Abstract

The present invention relates to a separator and a lithium-sulfur battery comprising same, the lithium-sulfur battery being capable of resolving a problem caused by lithium polysulfide, generated in aconventional lithium-sulfur battery, by having a separator in which at least one surface of a porous substrate is coated with a lithium ion conductive polymer and carbon nano tubes having an oxygen functional group.

Description

technical field [0001] This application claims priority and benefit from Korean Patent Application No. 10-2017-0147760 filed with the Korean Intellectual Property Office on November 8, 2017, the entire contents of which are incorporated herein by reference. [0002] The present invention relates to a separator capable of solving the problems caused by lithium polysulfide and a lithium-sulfur battery including the same. Background technique [0003] As electronic products, electronic devices, communication devices, etc. have recently become rapidly smaller and lighter, and the demand for electric vehicles has become increasingly prominent due to environmental concerns, there is a need to improve the performance of secondary batteries used as power sources for these products greatly increase. Among them, lithium secondary batteries have received considerable attention as high-performance batteries due to their high energy density and high standard electrode potential. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/052H01M50/414H01M50/417H01M50/423H01M50/426H01M50/429H01M50/449
CPCH01M10/052Y02E60/10H01M4/38H01M50/446H01M50/449Y02P70/50H01M50/417H01M50/429H01M50/414H01M50/423H01M50/426H01M50/491H01M50/463H01M50/411H01M50/431H01M50/46H01M10/0565H01M2300/0082
Inventor 宋知恩梁斗景梁胜普
Owner LG ENERGY SOLUTION LTD